{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/CountTokensRequest",
  "title": "CountTokensRequest",
  "type": "object",
  "required": [
    "model",
    "messages"
  ],
  "properties": {
    "model": {
      "type": "string",
      "description": "The model to use for token counting.",
      "example": "claude-sonnet-4-6"
    },
    "messages": {
      "type": "array",
      "description": "Input messages to count tokens for.",
      "items": {
        "$ref": "#/components/schemas/MessageParam"
      },
      "minItems": 1,
      "example": []
    },
    "system": {
      "description": "System prompt to include in the token count.",
      "oneOf": [
        {
          "type": "string"
        },
        {
          "type": "array",
          "items": {
            "$ref": "#/components/schemas/TextBlockParam"
          }
        }
      ],
      "example": "example_value"
    },
    "tools": {
      "type": "array",
      "description": "Tool definitions to include in the token count.",
      "items": {
        "$ref": "#/components/schemas/Tool"
      },
      "example": []
    },
    "thinking": {
      "$ref": "#/components/schemas/ThinkingConfig"
    }
  }
}